GlowShifts Blue LED Digital Tachometer with shift light is a vital accessory for those seeking a reliable tachometer and shift light combined into one easy to use, affordable unit. Each digital tachometer is mounted in a durable black metal pod and is a standalone unit that can be wired up to any vehicle with a 4, 6, 8 cylinder gasoline engine. Its three wire connection makes for a fast and easy installation to the vehicles coil or tach signal wire. (It may be necessary to install a tach adapter for multiple coil applications.) The unit is easily adjustable allowing you to select between 0 to 10,000 RPMs in 100 RPM increments. It connects securely into its included pedestal mount allowing you to position the tachometer in any desired location. GlowShift stands behind each unit with a one year limited warranty and free technical support.